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    Signal processing techniques for improving the sensitivity of GPS receivers
    21.
    发明申请
    Signal processing techniques for improving the sensitivity of GPS receivers 审中-公开

    公开(公告)号：US20100019970A1

    公开(公告)日：2010-01-28

    申请号：US12387889

    申请日：2009-05-09

    Applicant: Farrokh Farrokhi ,  Dickson Wong ,  Arthur J. Collmeyer

    Inventor： Farrokh Farrokhi ,  Dickson Wong ,  Arthur J. Collmeyer

    IPC: G01S1/00

    CPC classification number: G01S19/25

    Abstract: A system for measuring the pseudo range from a first GPS sensor to a designated navigational satellite, for use in a satellite positioning system (SPS) is comprised of first and second GPS sensors for receiving and recording first and second portions of the signal transmitted by the designated navigational satellite, the recordings referred to as the first and second datagrams; and means for transmitting the first and second datagrams to a datagram processing facility wherein the pseudo range from the first GPS sensor to the designated navigational satellite is extracted. The datagram processing facility for extracting the pseudo range is further comprised of a pseudo range engine for extracting a pseudo range from a datagram originating with said first GPS sensor, the location of which is to be determined, the extraction accomplished with the aid of a perfect reference; and a perfect reference engine for generating a perfect reference from a datagram originating with a second GPS sensor designated for the express purpose of perfect reference generation. The perfect reference reduces the minimum number of satellites required to fix a position from four to three, and further enables the pseudo range engine to recombine multi-path GPS signals.

    Crest factor reduction with phase optimization
    22.
    发明申请
    Crest factor reduction with phase optimization 失效
    波峰因数降低与相位优化

    公开(公告)号：US20090310710A1

    公开(公告)日：2009-12-17

    申请号：US12455952

    申请日：2009-06-09

    Applicant: Farrokh Farrokhi

    Inventor： Farrokh Farrokhi

    IPC: H04L27/12

    CPC classification number: H04L27/2621

    Abstract: A system for reducing peaks comprises a processor and a memory. The processor is configured to determine a phase offset for each of a plurality of input signals. The phase offset for each of the plurality of input signals are determined using one or more trials of phase offsets to determine a selected set of phase offsets. The processor is further configured to modulate the plurality of input data signals using the selected set of phase offsets to produce a plurality of modulated phase offset data signals and to generate a sum of the plurality of modulated phase offset data signals, wherein the sum has a lower peak value during a trial of the one or more trials of phase offsets as compared to the sum during another trial not using the selected set of phase offset signals. The memory is coupled to the processor and configured to provide the processor with instructions.

    Abstract translation: 用于降低峰值的系统包括处理器和存储器。 处理器被配置为确定多个输入信号中的每一个的相位偏移。 通过使用相位偏移的一个或多个试验来确定多个输入信号中的每一个的相位偏移，以确定所选择的相位偏移集合。 处理器还被配置为使用所选择的相位偏移组来调制多个输入数据信号，以产生多个调制相位偏移数据信号，并产生多个调制相位偏移数据信号的和，其中该和 与在不使用所选择的相位偏移信号组的另一次试验期间的总和相比，在相位偏移的一个或多个试验期间的试验期间较低的峰值。 存储器耦合到处理器并且被配置为向处理器提供指令。

    Crest factor reduction with phase optimization
    25.
    发明授权
    Crest factor reduction with phase optimization 失效
    波峰因数降低与相位优化

    公开(公告)号：US08509345B2

    公开(公告)日：2013-08-13

    申请号：US12455952

    申请日：2009-06-09

    Applicant: Farrokh Farrokhi

    Inventor： Farrokh Farrokhi

    IPC: H04K1/02

    CPC classification number: H04L27/2621

    Abstract: A system for reducing peaks comprises a processor and a memory. The processor is configured to determine phase offsets for a plurality of input signals. The phase offsets are determined using trials of phase offsets to determine a selected set of phase offsets. The processor is further configured to modulate the input data signals using the selected set of phase offsets to produce modulated phase offset data signals and to generate a sum of modulated phase offset data signals, such that the sum has a lower peak value as compared to the sum not using the selected set of phase offset signals.

    Abstract translation: 用于降低峰值的系统包括处理器和存储器。 处理器被配置为确定多个输入信号的相位偏移。 使用相位偏移的试验来确定相位偏移，以确定所选择的一组相位偏移。 处理器还被配置为使用所选择的相位偏移组来调制输入数据信号，以产生调制的相位偏移数据信号，并产生调制的相位偏移数据信号的和，使得与具有较低峰值的和 总和不使用所选择的一组相位偏移信号。

    System framework for mobile device location
    27.
    发明申请
    System framework for mobile device location 审中-公开
    移动设备定位系统框架

    公开(公告)号：US20120081250A1

    公开(公告)日：2012-04-05

    申请号：US12924618

    申请日：2010-10-01

    Applicant: Farrokh Farrokhi ,  Edmund Gregory Lee ,  Dickson T. Wong ,  Arthur J. Collmeyer

    Inventor： Farrokh Farrokhi ,  Edmund Gregory Lee ,  Dickson T. Wong ,  Arthur J. Collmeyer

    IPC: G01S19/48

    CPC classification number: G01S5/0252 ,  G01S19/05 ,  G01S19/42

    Abstract: A method for estimating the location of a beacon from an ensemble of measurements associated with said beacon, where, contained in each measurement, are GPS data from which surfaces of location may be extracted, together with the ID's of beacons detectable at the point of measurement, is disclosed. The method comprises extracting the canonical set of surfaces of location implicit in each of the associated measurements, and determining the estimate of the location of the beacon as the point for which a weighted sum of the squares of the distances to each of the surfaces so extracted is minimized. A system for the compilation of a database of beacon locations from measurements containing a time-stamped recording of the composite GPS signal (which recording is referred to as a datagram), together with the ID's and associated signal strengths of beacons detectable at the point of measurement, is also disclosed. The system comprises GPS signal processing means for extracting, from each time-stamped datagram, the canonic set of surfaces of location, and beacon location estimation means for estimating the location of a beacon from an ensemble of surfaces of location associated with said beacon.

    Abstract translation: 用于从与所述信标相关联的测量的集合估计信标的位置的方法，其中包含在每个测量中的GPS数据是可以从其中提取位置表面的GPS数据以及在测量点处可检测的信标的ID ，被披露。 该方法包括提取每个相关联测量中隐含的位置的规范表面集合，以及确定信标位置的估计，作为对于如此提取的每个表面的距离的平方的加权和的点 被最小化。 一种用于从包含复合GPS信号（该记录被称为数据报）的时间戳记录的测量的汇编数据库中的信标位置的数据库的系统，以及在该点处可检测的信标的ID和相关信号强度 测量也被披露。 该系统包括GPS信号处理装置，用于从每个时间戳数据报中提取位置表面的标准集合，以及信标位置估计装置，用于从与所述信标相关联的位置的表面集合估计信标的位置。

    Demodulation technique for GFSK and DPSK
    28.
    发明授权
    Demodulation technique for GFSK and DPSK 有权
    GFSK和DPSK的解调技术

    公开(公告)号：US08090060B2

    公开(公告)日：2012-01-03

    申请号：US11800357

    申请日：2007-05-04

    Applicant: Fredrik Brannstrom ,  Andrea Goldsmith ,  Farrokh Farrokhi ,  Behrooz Rezvani

    Inventor： Fredrik Brannstrom ,  Andrea Goldsmith ,  Farrokh Farrokhi ,  Behrooz Rezvani

    IPC: H04L27/06 ,  H04L27/38 ,  H04L27/14 ,  H03M13/03

    CPC classification number: H04L25/03057 ,  H04B7/0848 ,  H04B7/086 ,  H04L2025/03426

    Abstract: A technique for low-complexity high-performance coherent demodulation of GFSK signals involves utilizing a novel phase and frequency tracking mechanism coupled with a trellis search technique to track signal memory in the demodulation process. A method according to the technique may include modeling modulation based upon a trellis. The method may further include estimating unknown parameters, selecting a maximum likelihood path through the trellis, and mapping the maximum likelihood path to an output bit sequence. The technique is also applicable to DSPK and other applicable known or convenient protocols.

    Abstract translation: 用于GFSK信号的低复杂度高性能相干解调的技术涉及利用与网格搜索技术相结合的新型相位和频率跟踪机制来在解调过程中跟踪信号存储器。 根据该技术的方法可以包括基于网格的建模调制。 该方法还可以包括估计未知参数，选择通过网格的最大似然路径，以及将最大似然路径映射到输出比特序列。 该技术也适用于DSPK和其他适用的已知或方便的协议。

    Signal processing techniques for improving the sensitivity of GPS receivers
    30.
    发明申请
    Signal processing techniques for improving the sensitivity of GPS receivers 审中-公开
    用于提高GPS接收机灵敏度的信号处理技术

    公开(公告)号：US20110080320A1

    公开(公告)日：2011-04-07

    申请号：US12587099

    申请日：2009-10-02

    Applicant: Farrokh Farrokhi ,  Dickson T. Wong ,  Arthur J. Collmeyer

    Inventor： Farrokh Farrokhi ,  Dickson T. Wong ,  Arthur J. Collmeyer

    IPC: G01S19/22

    CPC classification number: G01S19/22 ,  G01S19/05 ,  G01S19/25 ,  G01S19/26

    Abstract: A system for measuring the pseudo range from a target GPS sensor to a designated navigational satellite, for use in a satellite positioning system (SPS) is comprised of multiple GPS sensors for receiving and recording portions of the signals transmitted by designated navigational satellites, the recordings referred to as datagrams; and means for transmitting the datagrams to a datagram processing facility wherein the pseudo range from the target GPS sensor to the designated navigational satellite is derived. The datagram processing facility for deriving the pseudo range is further comprised of a pseudo range engine for deriving a pseudo range from a datagram originating with said target GPS sensor, the location of which is to be determined, the derivation accomplished with the aid of a perfect reference; a perfect reference engine for generating a perfect reference from one or more satellite-specific datagrams: and a strong signal suppression engine for synthesizing satellite-specific datagrams from I/F signals recorded by reference GPS sensors designated for the express purpose of perfect reference generation. The perfect reference reduces the minimum signal strength required to acquire and accurately track GPS satellites at or near the horizon.

    Abstract translation: 用于测量从目标GPS传感器到用于卫星定位系统（SPS）的指定导航卫星的伪距离的系统由用于接收和记录由指定导航卫星发送的信号的部分的多个GPS传感器组成，记录 简称数据报; 以及用于将数据报发送到数据报处理设施的装置，其中从目标GPS传感器到指定的导航卫星的伪距离被导出。 用于导出伪距离的数据报处理设备还包括伪距引擎，用于从源于所述目标GPS传感器的数据报导出伪距离，该距离引擎的位置将被确定，借助于完美的 参考; 用于从一个或多个卫星专用数据报产生完美参考的完美参考引擎：以及强大的信号抑制引擎，用于根据为完美参考生成的明确目的而被指定的参考GPS传感器记录的I / F信号合成卫星专用数据报。 完美的参考降低了获取并准确跟踪地平线或附近的GPS卫星所需的最小信号强度。

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